‘Mamma Mia!’ is silly singalong foot-tapping ABBA-fest, a huge block of cheesiness that leaves a warm glow inside like a sugary bowl of Ready Brek. It’s one the most successful British films ever. So what about the sequel, ‘Mamma Mia! Here We Go Again’? Often sequels are rubbish. This one, though, is right on the money, money, money. The one liners are sharper, the flares wider, the platforms higher, the sequins flashier. The cast had a ball and so did we. And there wasn’t a dry eye in the house by the end.